Home › Wire size by amps › 20 amp › 200 ft

Wire size for 20 amps at 200 feet

20 A at 200 ft one-way

Voltage	Conductor	Minimum size	Voltage drop
120 V	Copper	4 AWG	2.46 V (2.05%)
120 V	Aluminum	3 AWG	3.22 V (2.69%)
240 V	Copper	8 AWG	6.11 V (2.55%)
240 V	Aluminum	6 AWG	6.46 V (2.69%)

Smallest size meeting NEC 75 °C ampacity (with 240.4(D) limits) and ≤3% drop at the full 20 A. Use 125% sizing for continuous loads; apply derating for more than 3 current-carrying conductors or high ambient temperature.

Adjust the numbers

Load current (amps)

One-way length (feet)

Voltage

Conductor

Max voltage drop (%)

Continuous load?

FAQ

What size wire for 20 amps at 200 feet?

At 240 V: 8 AWG copper keeps voltage drop under 3%. See the table for 120 V and aluminum.

Same current, other distances

X Facebook Reddit WhatsApp LinkedIn

Embed this free calculator on your site (copy & paste):

<iframe src="https://wiremath.pages.dev/wire-size/20-amp-200-feet/?embed=1" width="100%" height="640" style="border:1px solid #ddd;border-radius:12px" loading="lazy" title="WireMath calculator"></iframe><p style="font-size:13px">Calculator by <a href="https://wiremath.pages.dev/wire-size/20-amp-200-feet/">WireMath</a></p>

Free calculator by WireMath